FoxESS H1(G2)/AC1(G2) hybrid & AC-coupled (AU) error codes explained

The inverter cannot see a normal mains supply, so it has stopped exporting to the grid (and a hybrid system may switch to backup).

What you can do

• Check whether the rest of the house (or your neighbours) has power, and check your network operator's outage map
• Check the switchboard for a tripped solar supply main switch or inverter breaker. Only reset it once. If it trips again, leave it off and call an electrician
• Wait. Once normal grid power is back, the inverter normally reconnects by itself after its safety checks (often a few minutes)
• If grid power is normal but the alarm stays, call us

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter.

What you can do

• Wait. The inverter reconnects by itself once voltage is back within limits
• Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator
• Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid frequency moved outside the allowed range, so the inverter disconnected or reduced output as the standards require.

What you can do

• Wait for automatic reconnection
• If it happens often, record the times and contact us

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter.

What you can do

• Wait. The inverter reconnects by itself once voltage is back within limits
• Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator
• Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected.

What you can do

• If it happened once and the system recovered, keep an eye on it
• If it repeats, call us

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter's insulation check failed. FoxESS states this is how the earth fault alarm (IEC 62109-2 cl. 13.9) appears on this model: the screen shows the isolation fault and the red LED lights.

What you can do

• Do not touch panels, DC cables, rooftop isolators or the inverter's DC connectors
• If it clears by itself after the weather dries out, still report it, because repeated alarms point to a developing fault
• Book an electrician or call us. An insulation test needs specialist equipment
• If you see smoke, burn marks or smell burning, keep clear and call 000

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter measured leakage (residual) current flowing to earth above its safety limit and disconnected. This can indicate damaged insulation somewhere in the system.

What you can do

• Don't touch cabling or equipment
• If it happens repeatedly, or together with an insulation/isolation alarm, call an electrician or us promptly

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The DC voltage coming from the solar panels is higher than the inverter is rated for. Over-voltage can damage the inverter.

What you can do

• Do not touch the DC isolator or cables unless the manufacturer's owner shutdown tells you to
• Call us. The string design needs to be checked by a licensed installer

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter detected a problem with the earth (protective earth/PE) or with the neutral-to-earth connection. A sound earth is essential for electrical safety.

What you can do

• Do not touch the inverter, frames or cabling
• Leave the system off if it has shut down. Call a licensed electrician or us to test the earthing

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery's state of charge or voltage is low, so the system has stopped discharging it to protect the cells.

What you can do

• Allow it to recharge from solar (or the grid, if your settings allow)
• Check the app for other alarms that could be stopping charging
• If it stays low for days in good sun, call us. Batteries left flat for long periods can be damaged

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

H1(G2)/AC1(G2) hybrid & AC-coupled (AU) · Guide only. All work must be done by a licensed electrician. Get help with this code